US2489665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic feed for gas lifts
Assignee: Individual
•
Filing: 1945-03-29
•
Granted: 1949-11-29
•
Expires: 1965-03-29
Abstract
No abstract record available.
Inventors
- 👤 Charles M O'leary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:53
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/12; E21B43/121; E21B43/122; E21B43/123
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US347196A
Cited
US1827091A
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US2142482A
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US2078482A
Cited
US2142483A
Cited
US2142484A
Cited
US2229829A
Cited
US2391542A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |